1670621 has 4 divisors (see below), whose sum is σ = 1724544. Its totient is φ = 1616700.

The previous prime is 1670597. The next prime is 1670623. The reversal of 1670621 is 1260761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1260761 = 79 ⋅15959.

It is a cyclic number.

It is not a de Polignac number, because 1670621 - 2¹⁰ = 1669597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1670623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26915 + ... + 26976.

It is an arithmetic number, because the mean of its divisors is an integer number (431136).

2^1670621 is an apocalyptic number.

It is an amenable number.

1670621 is a deficient number, since it is larger than the sum of its proper divisors (53923).

1670621 is an equidigital number, since it uses as much as digits as its factorization.

1670621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53922.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1670621 is about 1292.5250481132. The cubic root of 1670621 is about 118.6568037013.

The spelling of 1670621 in words is "one million, six hundred seventy thousand, six hundred twenty-one".